Extremely angry and frustrated

Purchased a pair of adidas samba a mnth ago at Studio 88 Mitchells plain Promenade. I Noticed that the inner sole glue is coming out. While checking that I saw that one is made in China and the other one in cambodia meaning i have one pair of sneakers but left is made in china, right one made in cambodia. Went to the store in mitchells plain promenade. Waited a werk for feedback and was told they cant exchange it. Bear in mind the left foot feels softer than the right. I paid cash and for them to refuse where it was their problem not mine? Now i need to wear sneakers thats wrong? I am extremely upset and disappointed